<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <!-- 加载bootstrap依赖-->
    <link rel="stylesheet" href="/webjars/bootstrap/4.0.0/css/bootstrap.css" />
    <script src="/webjars/jquery/3.3.1/jquery.js"></script>
    <script src="/webjars/bootstrap/4.0.0/js/bootstrap.js"></script>
    <script src="/js/login.js"></script>
</head>
<body>

        <div style="width:600px;height:600px;margin-left: 100px;margin-top:300px;background: #EEEEEE">
            <div style="width:400px;height:100px;">
                <button id="btn1" class="btn info">登录按钮</button>
                <button id="btn3" class="btn btn-success">登录按钮</button>
            </div>
            <div style="width:300px;height:100px;">
                <button id="btn2" class="btn-outline-info">登录按钮2</button>
            </div>
        </div>
</body>
</html>